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Along with strontium carbonate, citrate and gluconate, strontium chloride belongs to the group of strontium salts. Strontium chloride is used in a wide range of dietary supplements. It is also an important ingredient found in toothpastes used to reduce teeth sensitivity. A radioactive form of strontium called strontium-89 chloride has significant effects in reducing pain caused by some forms of cancer. Strontium has four stable isotopes and several radioactive isotopes.